她的手指在镜子上留下了一个模糊的污迹。

Her fingers left a faint ___smudge on the mirror.

她不小心用手碰到了刚写好的字，结果把墨迹弄花了。

She accidentally touched the freshly written words with her hand and ___smudged the ink.

照片右上角有个模糊的污点，可能是镜头脏了。

There's a ___smudge in the top-right corner of the photo, probably from a dirty lens.